Question: The following data show the number of hours per day

The following data show the number of hours per day 12 adults spent in front of screens watching television related content:
1.3 4.9 4.2 4.8 7.6 6.9 5.4 2.2 5.3 1.8 2.4 8.3
a. Construct a 95% confidence interval to estimate the average number of hours per day adults spend in front of screens watching television related content.
b. Verify this interval using Excel.
c. What assumptions need to be made about this population ( other than the fact the people in it are watching too much television)?